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One of Clan Ghost Bear's second-line garrison Galaxies transferred from the Clan Homeworlds with the Clan's shift to the Ghost Bear Dominion, Sigma Galaxy underwent a curious transformation upon its arrival in the Inner Sphere. While the majority of the front-line invading Clusters in the Clan Ghost Bear Occupation Zone were unfriendly if not outright hostile to integration with the arriving Homeworld BattleMech and Elemental garrison troops, they were totally resistant to working with Combat Vehicle units at all. With Sigma Galaxy under the command of a veteran tank commander, many conventional vehicle troops requested transfer to the more welcoming Galaxy, swelling its TOE with tanks, hovercraft, VTOLs and other support vehicles. The expanded Sigma would dispatch its forces to reinforce the Bear's other Galaxies as needed, though only the second-line ones would request the vehicle galaxy's aid; the front-line galaxies would never request or accept such assistance.[1]

Following the liberation of Terra Sigma Galaxy incorporated the Sixth Bear Regulars, who were transferred into Sigma[4] from Omicron Galaxy[8] to compensate Sigma for the loss of the Seventh Bear Regulars; the Sixth had trouble adjusting to life in Sigma, however, viewing the Galaxy as being a vehicle galaxy.[4]

The Ghost Bear's Theta Galaxy had taken substantial damage during the Jihad, and the Dominion Council decided to disband a number of second-line Galaxies to assist in rebuilding various elements of the touman. Sigma Galaxy was one of the Galaxies chosen to be disbanded, with three complete Clusters[9] - the Sixth Bear Regulars, Tenth Phalanx and Twelfth Provisional Garrison Cluster - transferring into Theta Galaxy.[10] The Twenty-first Phalanx was transferred into Kappa Galaxy.[11]

It is assumed that Sigma Galaxy was disbanded in or around 3080 based upon the Tenth Phalanx write-up as a defending unit on Goito[9] during the Bloody Tricentennial attack against the Kappa-4 facility in 3080,[14] but this detail may only have been included within the Theta Galaxy write-up due to the absence of a Sigma Galaxy write-up within Field Manual: 3085.

In common with every other unit in the Clan Ghost Bear touman at this point in time, the units within Sigma Galaxy receive a +1 modifier to any dice roll on Random Weight-Class tables to determine Star or Binary/Trinary type.[15]

If a force from Sigma Galaxy includes both conventional vehicles and 'Mechs that force receives a +1 Bonus to Initiative rolls.[16]